What Similarities Do You See in the DNA Bases? In a single organism, what do you notice about the relative proportions of DNA bases?

A and T occur in similar proportions.

T and G occur in similar proportions.

A and C occur in similar proportions.

G and C occur in similar proportions.
A 5-column table labeled Relative Proportions of Bases in D N A has 7 rows. The first column is labeled Organism with entries human, chicken, grasshopper, sea urchin, wheat, yeast, and E. coli. The second column is labeled A with entries 30.9, 28.8, 29.3, 32.8, 27.3, 31.1, 24.7. The third column is labeled T with entries 29.4, 29.2, 29.3, 32.1, 27.1, 32.9, 23.6. The fourth column is labeled G with entries 19.9, 20.5, 20.5, 17.7, 22.7, 18.7, 26. The fifth column is labeled C with entries 19.8, 21.5, 20.7, 17.3, 22.8, 17.1, 25.7.

ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.

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